5 votes
Accepted

What kind of silicone glue should I use to attach my thermsistors?

The main requirement here is temperature resistance. A 3D printer extruder is very, very hot, and will easily exceed the ratings of many typical silicone glues in normal service or during a runaway ...
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  • 6,446
5 votes
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New thermistor isolation, how?

The most common choice for insulating thermistors is glass fiber sleeving. It tolerates very high temperatures, and is commonly rated for up to 600 °C. Teflon is also used but has a rather ...
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5 votes
Accepted

Hotend doesn't maintain temperature

Safety First Let's look at the graphs. First: you should swap firmware for one that has Thermal Runaway, as, as it is, running about 15 minutes with 28 K less than the printer is ordered to work at is ...
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  • 19.5k
4 votes
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MINTEMP error after crash

After replacing the control board, it now prints flawlessly. Apparently,I really did damage the control board...
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4 votes

New thermistor isolation, how?

I'm not sure if it fits the use you're describing, but Kapton (polyimide) tape is stable to about 400 degrees C. It can also be used as a build surface, so generally useful to have some. Kapton tape ...
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4 votes

RAMPS won't PID tune and shows unreal temps

This can come from several sources: Hardware The thermistor or its connections might be damaged, and the fault is only observable when the hotend is hot or moved to a certain area. Start by checking ...
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4 votes

Anet A8 reading 739°C from the extruder thermistor!

I had the same issue. Hot-end temperature reading stuck at 209 degrees even with hot-end thermistor disconnected or swapped with bed thermistor on the Anet A8 mainboard. After ordering and swapping ...
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4 votes

Change hotend thermistor input in Marlin

In pins_RAMPS.h you find which pins are used for which thermistor: // // Temperature Sensors // #define TEMP_0_PIN 13 // Analog Input #define TEMP_1_PIN 15 // Analog Input To use ...
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4 votes

How can I insulate my thermistor?

You can use kapton tape, small PTFE tube, or silicone tape. I use PTFE on my delta printer (I do have a silicone tape wrapped around my heat block, but that's to help with keeping the heat in the ...
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  • 241
4 votes
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Thermal runaway with specific prints

Thermal runaway protection (see What is Thermal Runaway Protection?) is triggered when the scheduled voltage to the heater element does not result in a specified increase in temperature within a ...
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  • 31k
4 votes

Ender 3 displaying wrong temperatures for hotend and bed

I got my printer fixed and am posting steps I took for people with similar problems in the future. Initial problem: After I replaced my entire heating unit and reconnected the wires, my printer ...
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4 votes

Do thermistors degrade in accuracy without hard failure?

Yes, thermistors can drift in value as well as outright failing (usually open). In my experience this is not uncommon in thermistors operated above 100 degrees C. The drift is typically downward in ...
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3 votes

How does Prusa3D firmware respond to an open or shorted thermistor during a print?

This sounds like a problem I had with my hotend cooling fan a couple years back. To answer your question, from what I'm reading, the Prusa3D firmware detects thermal runaway if the hotend temperature ...
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3 votes
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MK8 extruder showing 500+ °C on temperature sensor?

A brand new thermistor shows about 95-105k ohm (depends on the multimeter quality), so it looks like that one is out of the range. To be sure that it is a thermistor, you could connect a 100k ...
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3 votes
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RAMPS won't PID tune and shows unreal temps

One of the thermistor wires had come loose from the crimp ferrules. I re-crimped it and it works fine now.
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3 votes

Anet A8 reading 739°C from the extruder thermistor!

and found out it has a resistance of 1.5kΩ, while it should have a resistance of 4.7kΩ, so I suspect this is the main reason behind this high reading. Now the only thing left to figure out is how the ...
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3 votes
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Stainless tip for thermistor

The main problem here is that the hot block has to match the temp sensor. There are a couple available commercial options for hotblocks with cartridge-and-setscrew temp sensors, but they're not ...
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  • 6,446
3 votes

Stainless tip for thermistor

My thermistors came with a small spring surrounding them, which seems to work pretty well for this (see also E3D Thermistor Alternative). It's pretty close to the size of the spring in an ordinary pen,...
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  • 3,181
3 votes

Stainless tip for thermistor

I am not too sure what you're searching for, but I imagine it to be a kind of thermistor housing to distribute pressure from the screw while maintaining good heat conductance. I first have to say ...
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  • 2,854
3 votes

Are the thermsistors identical for both the heatbed and the extruder head?

This depends on how you ended up with your finished printer. If it was a kit, then there is a chance that the thermistors might be the same, however, even a kit manufacturer might buy parts that come ...
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  • 2,854
3 votes

Is there any way to correct uneven bed temperature?

I had this exact issue with my Qidi X-Plus. After checking with a thermometer there was a spread of 9°C - enough to burn in (always the same) certain areas when printing at higher extremes of ...
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  • 162
3 votes

Do thermistors degrade in accuracy without hard failure?

Most thermosensors are functionally nothing different but a temperature dependant resistor. As such, our boards usually use $U=RI$ to get to the resistance, and then compare that to a temperature ...
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2 votes

Heated bed thermistor placement

It doesn't make a great deal of difference where you place the thermistor; do whatever is most convenient for you. The temperature of the heated bed is not very critical, and some inaccuracy in the ...
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2 votes
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Heated bed thermistor placement

Depending on thermistor type you can get values from around 1ohm/C to 0.01ohm/C so placing it on particulat place on heatbed (HB) could be very important. If objects are placed in the center then it's ...
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  • 3,438
2 votes

E3D Thermistor Alternative

I like the mounting method on my Mk9 extruder: there's a small hole drilled into the heat block, parallel to the heater hole. B3 Innovations sells a thermistor packaged into a small spring. The whole ...
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  • 3,181
2 votes

How can I insulate my thermistor?

Ok, so I think I have found the answer. You can get cotton wraps for print heads with some Kapton tape on them, see 10Pcs 3mm Thickness 3D Printer Heating Cotton Hotend Nozzle Heat Insulation. I think ...
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2 votes
Accepted

How can I insulate my thermistor?

For an illustration of how to employ the Kapton tape, that is mentioned in the answers from Harvey Lim and Howler, watch How to build a RepRap Prusa i3 (Assembly 7) at 21:30: From 15:10 the heater ...
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  • 5,727
2 votes

New thermistor isolation, how?

I used Kapton tape to insulate mine.
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  • 21
2 votes

How can I insulate my thermistor?

You could use Kapton tape to tape the thermistor. It is usually the best option for sticking something onto the hotend or on the heat block. You will also have less trouble since it is very thin. ...
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  • 401
2 votes

Hotend heating failure too short before limit

There are many unknowns at this point, you need to work methodically through each stage. You probably also need some test equipment, at least a basic multimeter. Ideally a temperature probe too. ...
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